Development and construction of low-cracking high-performance concrete (LC-HPC) bridge decks : free shrinkage, moisture optimization and concrete production : final report.

Details

• Creators:
  Lindquist, Will ; Darwin, David ; Browning, JoAnn
• Corporate Creators:
  Kansas. Dept. of Transportation. Bureau of Materials & Research
• Corporate Contributors:
  University of Kansas
• Subject/TRT Terms:
  • Bridge decks
  • High performance concrete
  • Cracking of concrete pavements
  • Concrete bridges
  • Reinforced concrete
  • Pavements
• Publication/ Report Number:
  FHWA-KS-09-5
• Resource Type:
  Tech Report
• Geographical Coverage:
  Kansas
• Edition:
  Final report; June 2004-June 2009
• Corporate Publisher:
  Kansas. Dept. of Transportation. Bureau of Materials & Research
• Abstract:
  The development and evaluation of low-cracking high-performance concrete (LC-HPC) for use in bridge decks ; is described based on laboratory test results and experience gained during the construction of 14 bridges. This report ; emphasizes the material aspects of the construction process; a companion report will provide a detailed discussion of the ; construction, design, and environmental factors affecting the performance of LC-HPC bridge decks. ; The KU Mix design methodology for determining an optimized combined gradation uses the percent retained chart and ; the Modified Coarseness Factor Chart. The process begins by developing an ideal gradation followed by the determination of ; an optimum blend of user-selected aggregates. A Microsoft® Excel workbook enhanced with Visual Basic for Applications ; is available to perform the optimization process at www.iri.ku.edu. ; The second portion of the study involves evaluating the effect of paste content, water-cement (w/c) ratio, coarse ; aggregate type, mineral admixture type (silica fume, slag cement, and Class F fly ash each at two levels of replacement), ; cement type and fineness, a shrinkage reducing admixture, and the duration of curing on the free-shrinkage characteristics ; of concrete mixtures in the laboratory tested in accordance with ASTM C 157. ; The final portion of the study presents the specifications, construction experiences, and the preliminary evaluation of ; 14 LC-HPC bridge decks that have been built or are planned in Kansas. The techniques used to reduce cracking in these ; bridge decks are presented, and the field experiences for the 18 individual LC-HPC placements completed to date are ; presented. The results indicate that LC-HPC decks with an optimized aggregate gradation and design w/c ratios of 0.44 and ; 0.45 with cement contents of 317 and 320 kg/m3 (535 and 540 lb/yd3) have more than adequate workability, finishability, ; and pumpability, in addition to reduced cracking. A preliminary evaluation of these decks indicates that, on average, the ; LC-HPC decks are performing at a level approximately equal to or exceeding the best performing monolithic decks in ; Kansas surveyed over the past 15 years.
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• Format:
  PDF
• Funding:
  C1465
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16821/dot_16821_DS1.pdf
• File Type:
  [PDF - 8.32 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:79fca298337bcf432486a4506316dde2f14e6df116816d2110ae6b61a1faa3c0